Exotic materials and tighter tolerances are extra. I should be able to hold +-.001 on the lathe, and +-.003 on the mill. Tens of millionths at work, but I don't have access to them .

pipeboyswe wrote:I would need a 10mm bullet mold (3 cavity) made in aluminium, something like the one in gippetos tutorial http://www.spudfiles.com/forums/easy-sp ... 17366.html no handels just a simpel cheap one what would it cost in round numbers? and i live in Sweden.

Actually, that would be quite expensive. It needs custom tooling or CNC for the nose (unless the standard ~118* point is fine). Is one spout for each bullet okay?

Figure 8" total of aluminum bar (all I have is 1x1.25, with no ability to rip cut) - $4 2" 1/2" aluminum for locating pins - $1 (if that)spade bit - $4 (not sure)grinding- tolerance dependent; I think I have a radius gauge, but no CMM or optical comparator, maybe $3

drilling/pressing: $5 maybe (5 total holes)

cleaning the basement to the point where I can access the machines again and setting up the grinder: priceless

pipeboyswe wrote:Hmm that was not what i expected, 17$ + shipping One spout is fine, and is a spade bit necessary? cant you just use a sharpish drill just to make it simple so the nose of the bullet gets kind of round it dosent need to be that sharp. And skip the locating pins and go with 4 holes + bolts. What do you think?

Your project needs to be made on a CNC mill. No custom tooling required.....just a ball nose end mill. Considering the cost of CAD-CAM software, computer, programing time, CNC milling machine and actual run time etc., etc., this option isn't available within your budget range.

Your best option might be following Gippetos example and hope to duplicate the result but, I'm sure even that method will cost more than $17.

velocity3x wrote:Your project needs to be made on a CNC mill. No custom tooling required.....just a ball nose end mill. Considering the cost of CAD-CAM software, computer, programing time, CNC milling machine and actual run time etc., etc., this option isn't available within your budget range.

It could probably be done with a ball end mill and a drill press, but you still need the ball end mill (which I don't have, sadly, especially in 10mm). With CNC, you could do it with any ball end mill less than 10mm. A good ball end mill seems to be going for like $15 in the US, ($120 on McMaster)

Edited by jrrdw, fixed quote tag.

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POLAND_SPUD wrote:even if there was no link I'd know it's a bot because of female name

POLAND_SPUD wrote:not everything will be very comlicated... I guess that most ppl will order a piston with o-ring grooves or something like that

I was discussing this with LeMaudit, some projects which you might think are straightforward to machine are actually quite challenging, I can say from my recent experiences that there are a heck of a lot of things I never considered - so there might be some frustration ahead for both parties.

My suggestion would be that requests be made publicly on this thread, including posting of drawings. I doubt there will be the sort of "I'll make it for $5 less!" competition as this isn't really a commercial venture, but it will allow those with machining experience to critique the design and spot potential pitfalls while suggesting improvements.

I wouldn't want to pay a "Wouldbe Dentist" to learn on my teeth.

Here dental students offer teeth cleaning and other services for free in order to get experience

ramses wrote:A good ball end mill seems to be going for like $15 in the US, ($120 on McMaster)

McMaster is a great place but, not the place to buy machine tooling. MSC carries quality tooling for less than McMaster. Enco (an MSC subsidiary) has even lower prices but, not the high end items and vast selection carried by MSC.

ramses wrote:A good ball end mill seems to be going for like $15 in the US, ($120 on McMaster)

McMaster is a great place but, not the place to buy machine tooling. MSC carries quality tooling for less than McMaster. Enco (an MSC subsidiary) has even lower prices but, not the high end items and vast selection carried by MSC.

I'm aware. That's why I mentioned that I could get one on eBay for $15.00 + shipping. And I think that was an Iscar (USA made and expensive)..

In all fairness, the one from McMaster was fine grain solid carbide coated in TiAlN.

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POLAND_SPUD wrote:even if there was no link I'd know it's a bot because of female name

My suggestion would be that requests be made publicly on this thread, including posting of drawings.

I second that

Making a clear and precise drawing is a work that should be done first. It is mandatory for any kind of machining work. Possibly there's some things that a machinist will want to change afterward to simplify the making, thus reducing time/cost and maybe adapting to material at hand. People could also suggest simplifications, again with a machining point of view, and this will be great for non-machinist users to read and learn why a complex design can be easy to cut, and why a simple design may be impossible! It would also be great to learn from advises and how-to for wannabe machinists like JSR and myself

Talking about myself, it would not be a question of cost, but more a question of time. The less time I'll have to spend on a design, the more chances there will be that I can help someone. Cutting is fast when you know exactly what to do.

My suggestion would be that requests be made publicly on this thread, including posting of drawings.

I second that

Making a clear and precise drawing is a work that should be done first. It is mandatory for any kind of machining work. Possibly there's some things that a machinist will want to change afterward to simplify the making, thus reducing time/cost and maybe adapting to material at hand. People could also suggest simplifications, again with a machining point of view, and this will be great for non-machinist users to read and learn why a complex design can be easy to cut, and why a simple design may be impossible! It would also be great to learn from advises and how-to for wannabe machinists like JSR and myself

Talking about myself, it would not be a question of cost, but more a question of time. The less time I'll have to spend on a design, the more chances there will be that I can help someone. Cutting is fast when you know exactly what to do.

Thirded, although I can understand where people would be leery about posting "secret" designs for contests and such.

Also, post TOLERANCES!!!!! If I need to hold +- 1 thou, it will take longer, but if I can have 50, it'll be a breeze. Also keep in mind the tolerances you actually need. You don't need +- .0003 diameter on a ~.2" hole 1.2" deep that will hold a roll pin that I will be pressing in! (but tell that Eaton corporation)

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POLAND_SPUD wrote:even if there was no link I'd know it's a bot because of female name

ramses wrote:Also, post TOLERANCES!!!!! If I need to hold +- 1 thou, it will take longer, but if I can have 50, it'll be a breeze. Also keep in mind the tolerances you actually need. You don't need +- .0003 diameter on a ~.2" hole 1.2" deep that will hold a roll pin that I will be pressing in! (but tell that Eaton corporation)

.050 is a rediculous tolerance for a machined part!
1/16 is .0625, close to a carpenter's tight tolerance.